WO2022067937A1

WO2022067937A1 - Display device

Info

Publication number: WO2022067937A1
Application number: PCT/CN2020/125259
Authority: WO
Inventors: 田栋
Original assignee: 武汉华星光电技术有限公司
Priority date: 2020-09-29
Filing date: 2020-10-30
Publication date: 2022-04-07
Also published as: US20220304140A1; US11716809B2; CN112086016A

Abstract

Disclosed is a display device. The display device comprises: a display panel (10), which comprises a first panel surface (11) and a second panel surface (12) facing away from each other; a backlight module (20), which comprises a first module surface (21) and a second module surface (22) facing away from each other, wherein the first module surface (21) is attached to the second panel surface (12); a circuit board (30), wherein one end thereof is attached to the first panel surface (11), and the other end thereof is bent to the second module surface (22); and an adhesive layer (40), which comprises a first adhesive layer surface (41) and a second adhesive layer surface (42) facing away from each other, wherein the first adhesive layer surface (41) is bonded to the side surface of the backlight module (20) that is close to the circuit board (30), and the second adhesive layer surface (42) is bonded to the circuit board (30).

Description

display device

technical field

The present application specifically relates to display devices.

Background technique

Conventional display device design usually bends the flexible circuit board from one side of the display panel to the side of the backlight module, thereby reducing the frame ratio on the front of the display panel. However, due to the flexibility of the flexible circuit board material, as shown in Figure 1 , FIG. 1 is a schematic diagram of a display device in the prior art. The circuit board 30 will have a larger bending radius when being bent, so that the distance between the backlight module 20 and the circuit board 30 is too large, and the frame of the display device is too large and the screen ratio is small.

technical problem

The present invention provides a display device to solve the technical problem in the prior art that the frame ratio of the display device is too large and the screen ratio is small because the distance between the circuit board and the backlight module is too large when the circuit board is bent.

technical solutions

The technical solution for solving the above-mentioned technical problems is as follows: the present invention provides a display device, including a display panel, including a panel first surface and a panel second surface that are away from each other; a backlight module, including a module first surface away from each other and the second surface of the module; the first surface of the module is attached to the second surface of the panel; one end of the circuit board is attached to the first surface of the panel, and the other end is bent to the second surface of the module; and an adhesive layer, including a first surface of the adhesive layer and a second surface of the adhesive layer that are away from each other, the first surface of the adhesive layer is bonded to a side of the backlight module close to the circuit board, and the second surface of the adhesive layer is bonded to the circuit board.

Further, the display panel further includes a display area disposed in the middle of the first surface of the panel; and a non-display area surrounding the display area, and one end of the circuit board is connected to the non-display area.

Further, the circuit board includes a bonding portion connected to the non-display area of the display panel; a bending portion connected to the bonding portion and disposed opposite to one side of the backlight module; and components The part is connected to the bending part and is arranged opposite to the second surface of the module.

Further, the bending portion includes a bending plane, one side of which is connected to the adhesive layer.

Further, the backlight module includes a first corner, which is located at the junction between the first surface of the module of the backlight module and a side surface; the second corner is located between the first surface of the module and a side of the backlight module. Junction.

Further, the bending portion includes two bending corners, respectively corresponding to the first corner and the second corner of the backlight module.

Further, the display device further includes a plurality of through holes which penetrate through the bending portion and are located at a bending corner.

Further, the distance between two adjacent through holes is greater than the width of any through hole.

Further, the radial cross-section of the through hole is at least one of a circle, a diamond, and an ellipse.

Further, the width of the through hole is 0.05mm˜0.1mm.

beneficial effect

The beneficial effect of the present invention is that when the display device of the present invention is bent to the back of the backlight module, the backlight module and the bent portion of the circuit board are bonded together through an adhesive layer, which greatly reduces the number of circuit boards. The distance from the backlight module reduces the frame size of the display device, and at the same time, a number of through holes are opened at the bends of the circuit board to release the concentrated stress of the circuit board at the corners of the bends and prevent the stress from being concentrated in the bends. The circuit board is broken at a certain place, which is beneficial to improve the service life of the circuit board.

Description of drawings

The technical solutions and other beneficial effects of the present application will be apparent through the detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings.

FIG. 1 is a schematic diagram of a display device in the prior art.

FIG. 2 is a schematic diagram of a display device in an embodiment.

FIG. 3 is a schematic diagram of a circuit board structure in an embodiment.

FIG. 4 is a side view of the display panel in the embodiment.

FIG. 5 is a side view of the backlight module in the embodiment.

FIG. 6 is a schematic diagram of the structure of the circuit board and the adhesive layer in the embodiment.

FIG. 7 is a side view of the display device in the embodiment.

FIG. 8 is a schematic structural diagram of a display panel and a circuit board in an embodiment.

The part numbers in the figure are as follows:

Display panel 10; Backlight module 20;

circuit board 30; glue layer 40;

Panel first surface 11; Panel second surface 12;

The first surface 21 of the module; the second surface 22 of the module;

The first surface 41 of the adhesive layer; the second surface 42 of the adhesive layer;

display area 101; non-display area 102;

Bonding part 31; Bending part 32;

element part 33; bending plane 321;

Bending corner 322; through hole 34;

Corner 23.

Embodiments of the present invention

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

Example

As shown in FIG. 2 , in this embodiment, the display device of the present invention includes a display panel 10 , a backlight module 20 , a circuit board 30 and an adhesive layer 40 .

As shown in FIG. 4 and FIG. 8 , the display panel 10 includes a first panel surface 11 and a panel second surface 12 that are away from each other, and the panel first surface 11 is a display surface for displaying images. Specifically, the first surface 11 of the panel includes a display area 101 and a non-display area 102, the display area 101 is located in the middle of the first surface 11 of the panel, and its area accounts for 90% to 95% of the area of the entire first surface 11 of the panel, so as to achieve For the high screen ratio of the display panel 10 , the non-display area 102 is arranged around the display area 101 to accommodate the non-light-emitting traces in the display panel 10 . light leaks.

As shown in FIG. 5 , the backlight module 20 includes a first module surface 21 and a module second surface 22 that are away from each other. The first surface 21 of the module is attached to the second surface 12 of the panel. The first surface 21 of the module is a light-emitting surface, and the light-emitting surface faces the display panel 10. A light-emitting source is provided inside the backlight module 20, and the light emitted by the light-emitting source shines into the display panel 10 through the light-emitting surface, so that the The panel first surface 11 of the display panel 10 can form a display screen.

As shown in FIG. 6 , the circuit board 30 includes a bonding portion 31 , a bending portion 32 and a component portion 33 , wherein a plurality of metal pins are distributed on the bonding portion 31 , and the metal pins are bonded on In the non-display area 102 of the display panel 10 , specifically, in the non-display area 102 of the display panel 10 , there are several broken cross sections of metal wires corresponding to the metal pins, and the metal wires are routed through welding. The broken wire section is connected with the metal pins, so that the circuit board 30 can transmit electrical signals to the display panel 10 . Thereby, the driving display of the display panel 10 is realized.

In order to further reduce the proportion of the non-display area 102 of the display panel 10 , the circuit board 30 is usually a flexible circuit board, and the circuit board 30 is bent from the panel first surface 11 of the display panel 10 to the module first of the backlight module 20 . However, during the bending process, due to the elasticity of the circuit board 30, the bending portion 32 of the circuit board 30 will be bent toward the backlight module 20 with a certain bending radius, so that the bending portion 32 and the backlight are There is a certain gap between the sides of the module 20 , and the gap will cause the frame ratio of the entire display device to be too high, which is not conducive to realizing the effect of the ultra-narrow frame.

As shown in FIG. 6 and FIG. 7 , in this embodiment, a layer of adhesive layer 40 is prepared on the side surface of the backlight module 20 . The adhesive layer 40 has a double-sided adhesive effect. In other preferred embodiments of the present invention, the adhesive layer 40 is a double-sided adhesive material. The adhesive layer 40 includes a first surface 41 of the adhesive layer and a second surface 42 of the adhesive layer, the first surface 41 of the adhesive layer is adhered to the opposite side of the backlight module 20 and the circuit board 30, and the second surface 42 of the adhesive layer is adhered to. connected to the circuit board 30 . Through the adhesive ability of the adhesive layer 40, the elasticity of the circuit board 30 can be overcome, so that the bent portion 32 of the circuit board 30 can be attached to one side of the backlight module 20, which greatly reduces the bending of the backlight module 20. The gap between the folding parts 32 reduces the frame ratio of the display device.

Specifically, as shown in FIG. 3 , when the bending portion 32 is attached to the adhesive layer 40 , a bending plane 321 and two bending corners 322 are formed, and the bending corners 322 correspond to the two corners of the backlight module 20 . 23, wherein, the bending plane 321 is the part in contact with the adhesive layer 40, the bending plane 321 is closely attached to one side of the backlight module 20 through the adhesive layer 40, and the two bending corners 322 are respectively set on the bending plane 321 The two ends of , and are respectively connected with the bonding part 31 and the element part 33 . At this time, all or most of the bending stress of the entire circuit board 30 is concentrated at the two bending corners 322, resulting in excessive stress at the bending corners 322. In order to relieve the stress at the bending corners 322, as shown in FIG. 8 In this embodiment, a number of through holes 34 are opened at the two bending corners 322, the arrangement direction of the through holes 32 is parallel to the bending center line of the bending corner 322, and the radial cross-sectional pattern of the through holes 32 is a circle, Oval or rhombus. When the circuit board 30 is bent, the through holes 34 can be deformed to a certain extent at the bending corners 322 to achieve the effect of releasing the stress at the bending corners 322 and avoid excessive stress at the two bending corners 322. The circuit board 30 is broken. In order to prevent the size of the through hole 32 from affecting the bending life of the circuit board 30 , in this embodiment, the size of the through hole 32 is 0.05mm-0.1mm, and the distance between two adjacent through holes 32 is larger than the size of any through hole 32 .

The component part 33 is arranged on the second surface 22 of the module of the backlight module 20. Specifically, the surface of the component part 33 facing the backlight module 20 is provided with a number of circuit components and patterned wires for transmitting and processing electricity. Signal.

The beneficial effect of this embodiment is that, in the display device in this embodiment, when the circuit board is bent to the back of the backlight module, the backlight module and the bent portion of the circuit board are bonded together through an adhesive layer, which greatly reduces the The distance between the circuit board and the backlight module is reduced, and the frame ratio of the display device is reduced. At the same time, a number of through holes are opened at the bend of the circuit board to release the concentrated stress of the circuit board at the bend, which is conducive to improving the use of the circuit board. life.

The descriptions of the above embodiments are only used to help understand the technical solutions of the present application and their core ideas; those of ordinary skill in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some of the technical solutions can be modified. The features are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

A display device comprising

a display panel, comprising a panel first surface and a panel second surface facing away from each other;

a backlight module, comprising a first surface of the module and a second surface of the module that are away from each other; the first surface of the module is attached to the second surface of the panel;

a circuit board, one end is attached to the first surface of the panel, and the other end is bent to the second surface of the module; and

The adhesive layer includes a first surface of the adhesive layer and a second surface of the adhesive layer that are away from each other, the first surface of the adhesive layer is bonded to a side of the backlight module close to the circuit board, and the second surface of the adhesive layer is bonded to the the circuit board.
The display device according to claim 1, wherein,

The display panel also includes

a display area, located in the middle of the first surface of the panel; and

The non-display area surrounds the display area, and one end of the circuit board is connected to the non-display area.
The display device according to claim 1, wherein,

The circuit board includes

a bonding part, connected to the non-display area of the display panel;

a bending portion, connected to the bonding portion, and disposed opposite to a side surface of the backlight module; and

The element part is connected to the bending part and is arranged opposite to the second surface of the module.
The display device according to claim 3, wherein,

The bent portion includes

Bend the plane, one side of which is connected with the adhesive layer.
The display device according to claim 3, wherein,

The backlight module includes

The first corner is located at the junction of the first surface of the module of the backlight module and a side surface;

The second corner is located at the connection between the first surface and one side surface of the module of the backlight module.
The display device according to claim 3, wherein,

The bent portion includes

The two bent corners respectively correspond to the first corner and the second corner of the backlight module.
The display device of claim 6, further comprising

A plurality of through holes pass through the bending portion and are located at a bending corner.
The display device according to claim 7, wherein,

The distance between two adjacent through holes is greater than the width of any through hole.
The display device according to claim 7, wherein,

The radial section of the through hole is at least one of a circle, a rhombus, and an ellipse.
The display device according to claim 1, wherein,

The width of the through hole is 0.05mm˜0.1mm.